Being one shotted by a 2 handed hammer is a balance issue, not a difficulty issue. The way being one shotted makes a game more difficult is simply uncreative, lazy, and cheap. Tes combat as a whole is a joke though. A better way to increase difficulty in skyrim would be like the hardcore mode in new vegas, and taking fast travel away / discovered locations off of maps.

The problem with the highest difficulty in skyrim to me mostly, is if I use my mastered skills its to easy, but if you use novice skills they are to weak.. Its just horrible balance, it's not like you can use a whole mess of strategy/tactics.